initial skeleton for a Grid canvas item
This commit is contained in:
Paul Davis
71
libs/canvas/canvas/grid.h
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71
libs/canvas/canvas/grid.h
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/*
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Copyright (C) 2018 Paul Davis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef __CANVAS_GRID_H__
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#define __CANVAS_GRID_H__
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#include "canvas/item.h"
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namespace ArdourCanvas
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{
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class Rectangle;
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/** Canvas container that renders its children in a grid layout
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*/
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class LIBCANVAS_API Grid : public Item
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{
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public:
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Grid (Canvas *);
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Grid (Item *);
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Grid (Item *, Duple const & position);
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void set_spacing (double s);
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void set_padding (double top, double right = -1.0, double bottom = -1.0, double left = -1.0);
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void set_margin (double top, double right = -1.0, double bottom = -1.0, double left = -1.0);
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/* aliases so that CSS box model terms work */
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void set_border_width (double w) { set_outline_width (w); }
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void set_border_color (Color c) { set_outline_color (c); }
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void place(Item*, Duple coord);
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void set_collapse_on_hide (bool);
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void set_homogenous (bool);
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void compute_bounding_box () const;
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void render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const;
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protected:
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double spacing;
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double top_padding, right_padding, bottom_padding, left_padding;
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double top_margin, right_margin, bottom_margin, left_margin;
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void child_changed ();
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private:
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Rectangle *self;
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bool collapse_on_hide;
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bool homogenous;
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void reset_self ();
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void reposition_children ();
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};
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}
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#endif
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205
libs/canvas/grid.cc
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205
libs/canvas/grid.cc
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@@ -0,0 +1,205 @@
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/*
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Copyright (C) 2018 Paul Davis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <algorithm>
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#include "canvas/grid.h"
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#include "canvas/rectangle.h"
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using namespace ArdourCanvas;
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Grid::Grid (Canvas* canvas)
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: Item (canvas)
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, spacing (0)
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, top_padding (0), right_padding (0), bottom_padding (0), left_padding (0)
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, top_margin (0), right_margin (0), bottom_margin (0), left_margin (0)
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, homogenous (false)
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{
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self = new Rectangle (this);
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self->set_outline (false);
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self->set_fill (false);
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}
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Grid::Grid (Item* parent)
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: Item (parent)
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, spacing (0)
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, top_padding (0), right_padding (0), bottom_padding (0), left_padding (0)
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, top_margin (0), right_margin (0), bottom_margin (0), left_margin (0)
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, homogenous (false)
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{
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self = new Rectangle (this);
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self->set_outline (false);
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self->set_fill (false);
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}
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Grid::Grid (Item* parent, Duple const & p)
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: Item (parent, p)
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, spacing (0)
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, top_padding (0), right_padding (0), bottom_padding (0), left_padding (0)
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, top_margin (0), right_margin (0), bottom_margin (0), left_margin (0)
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, homogenous (false)
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{
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self = new Rectangle (this);
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self->set_outline (false);
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self->set_fill (false);
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}
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void
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Grid::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
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{
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Item::render_children (area, context);
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}
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void
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Grid::compute_bounding_box () const
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{
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_bounding_box = boost::none;
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if (_items.empty()) {
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_bounding_box_dirty = false;
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return;
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}
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add_child_bounding_boxes (!collapse_on_hide);
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if (_bounding_box) {
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Rect r = _bounding_box.get();
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_bounding_box = r.expand (top_padding + outline_width() + top_margin,
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right_padding + outline_width() + right_margin,
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bottom_padding + outline_width() + bottom_margin,
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left_padding + outline_width() + left_margin);
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}
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_bounding_box_dirty = false;
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}
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void
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Grid::set_spacing (double s)
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{
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spacing = s;
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}
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void
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Grid::set_padding (double t, double r, double b, double l)
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{
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double last = t;
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top_padding = t;
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if (r >= 0) {
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last = r;
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}
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right_padding = last;
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if (b >= 0) {
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last = b;
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}
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bottom_padding = last;
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if (l >= 0) {
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last = l;
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}
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left_padding = last;
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}
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void
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Grid::set_margin (double t, double r, double b, double l)
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{
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double last = t;
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top_margin = t;
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if (r >= 0) {
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last = r;
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}
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right_margin = last;
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if (b >= 0) {
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last = b;
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}
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bottom_margin = last;
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if (l >= 0) {
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last = l;
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}
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left_margin = last;
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}
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void
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Grid::reset_self ()
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{
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if (_bounding_box_dirty) {
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compute_bounding_box ();
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}
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if (!_bounding_box) {
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self->hide ();
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return;
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}
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Rect r (_bounding_box.get());
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/* XXX need to shrink by margin */
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self->set (r);
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}
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void
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Grid::reposition_children ()
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{
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Duple previous_edge (0, 0);
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Distance largest_width = 0;
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Distance largest_height = 0;
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if (homogenous) {
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for (std::list<Item*>::iterator i = _items.begin(); ++i != _items.end(); ++i) {
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boost::optional<Rect> bb = (*i)->bounding_box();
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if (bb) {
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largest_height = std::max (largest_height, bb.get().height());
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largest_width = std::max (largest_width, bb.get().width());
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}
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}
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}
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for (std::list<Item*>::iterator i = _items.begin(); ++i != _items.end(); ++i) {
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}
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_bounding_box_dirty = true;
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reset_self ();
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}
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void
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Grid::place (Item* i, Duple at)
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{
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}
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void
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Grid::child_changed ()
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{
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/* catch visibility and size changes */
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Item::child_changed ();
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reposition_children ();
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}
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void
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Grid::set_collapse_on_hide (bool yn)
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{
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if (collapse_on_hide != yn) {
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collapse_on_hide = yn;
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reposition_children ();
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}
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}
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